How do I fix "Thumbnail Cache Initialisation Failed" on version 5.0.2?

I've used Adobe Photoshop Version 5.0.2 for YEARS and I've loved it. Now I can't access any photo's - says "Thumbnail Cache Initialisation Failed". How do I fix this, or if I reload the software, what will happen? I need to access my photo's and keep them in their albums. Please help!!! Thanks very much, Ann Easton South Africa